Name of Student:
Teacher’s Name : Mr. Chia Hwee Tsong
Class
: F2 B4
Lesson No.
: 53
Date, Day
: 25-September-2018 (Tue)
Time
: 0800 -0945
SEKOLAH MENENGAH SERI OMEGA
Subject
: SCIENCE
Chapter/Topic : Chapter 9 Heat
Sub-topic
: 9.3 Expansion and Contraction of Matter;
9.4 Relationship between type of surface of object with absorption and release of heat
Expansion and Contraction of Matter.
1.
All matter (s......................., l............................ and g.............) expand when heated and contract when
cooled or releases heat.
2.
3.
Process: When a matter is heated, the particles ........................ energy.
a.
The particles vibrate/ moves .....................
b.
The distance between particles increases and the volume .............................
c.
The matter .........................
Process: When a matter is cooled, the particles ........................ energy.
a.
The particles vibrate/ moves more .....................
b.
The distance between particles decreases and the volume .............................
c.
The matter .........................
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The uses of Expansion and Contraction of Matter in Daily Life
1.
2.
3.
The mercury in the thermometer:
a.
Mercury is a heat ..............................
b.
It expands and contracts when there is change in temperature.
Gaps in the railway track:
a.
Theses gaps allow the rails to expand in ............ weather.
b.
Without these gaps, the tracks will buckle and overlap.
Rollers on a steel bridge:
a.
Rollers are built at one end while gap is found on another end.
b.
These the bridge to expand in hot weather.
c.
Prevent bridge from being ............... or damaged.
2
4.
The bimetallic strip in a fire alarm
a.
The bimetallic strip is made from two different types of metal strips that expand and contract at
............................... rates.
b.
Process:
i.
When fire occurs, the temperature .................................
ii.
The ............................ strip expands more than the ........................../ steel strip.
Iii. The bimetallic strip ..................... and touches the contact point.
iv.
The circuit is complete.
v.
The alarm bells ..................
Exercise A:
1.
The diagram below shows the metal ball cannot pass through the metal ring after it is heated.
By using kinetic theory of particles, explain what happens to the metal ball when it is heated.
When the metal ball is heated, its particles ................................. and ....................... .......................
This causes the ................................. between particles to .............................. and the volume of the
metal ball ........................... So, the metal ball ...............................
2.
The apparatus and materials shown in the diagram are prepared to study the expansion of a liquid.
3
When flask of coloured water is placed in the basin of hot water, the water level in the glass tube falls a
little and then rises.
State an inference for each of the following observations.
a.
The water level falls a little first.
The flask is ............................ before the water in it ........................
b.
The water level rises.
The coloured water is ........................... when it is ...............................
3.
4.
Mark a tick (√) for the correct statement.
a.
A liquid that expands will experience a decrease in its volume.
(
)
b.
Different liquids expand and contract at different rates.
(
)
The diagram below shows a steel bridge.
a.
State the function of the rollers which are located at one end of a steel bridge.
Allows the bridge to ................................... and ....................................
b.
Predict what will happen to the steel bridge if both ends are fixed.
The steel bridge will ................................
5.
Different metals expand at different rates when they are heated:
4
The following list shows the increasing order in expansion when the metals are heated.
Metal M ->
Metal N ->
Metal N ->
Metal P
Circle the metal pair with correct curve after heating.
Relationship between Types of Surface of Object and Heat Absorption and Emission
1.
The ability of an object to .......................... or .......................... heat depends on the type and
..................... of its surface.
2.
Absorbing and Radiating heat.
a.
Definition :
Absorber is substance absorbs heat from surrounding
b.
Definition:
Radiatoris substance releases heat to the surrounding.
3.
Good absorber and good radiator have ......................... and ...................... surface
4.
Poor absorber and poor radiator have ............................. and ....................surface
Activity 1:
Good heat absorber
An activity is carried out to study how a dark and dull object absorbs heat better than a white and shiny object
as shown in the diagram below.
The resule is recorded in the table below.
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1.
State the hypothesis for the activity above.
A ................... and ..................... object absorbs heat bettet than a .................... and .................... object.
2.
3.
State the following variables:
a.
Manipulated:
.......................................................................................................................................
b.
Responding:
.......................................................................................................................................
c.
Constant:
.......................................................................................................................................
State the surface that absorbs heat better.
............................................................................................................................................................................
4.
What is the type of heat flow in the activity above?
...........................................................................................................................................................................
5.
What is the function of the heated wire gauze?
As a source of radiant .....................
Activity 2:
Good Heat Radiator
The diagram below shows an activity to study how a dark and dull object releases heat better than a white and
shiny object.
1.
State the hypothesis for the activity above.
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A ................... and ..................... object absorbs heat bettet than a .................... and .................... object.
2.
3.
State the following variables:
a.
Manipulated:
.......................................................................................................................................
b.
Responding:
.......................................................................................................................................
c.
Constant:
.......................................................................................................................................
State the surface that releases heat better.
............................................................................................................................................................................
4.
What is the type of heat flow that takes placein the conical flask in the activity above?
...........................................................................................................................................................................
5.
What is the function of the wooden block?
Prevent heat flow by c.......................................
Heat Concept in Daily Life
The ....................... .......................... Concept is an idea developed to reduce the effects of rapid development
on the environment and our health.
The featurew of green buildings are listed below.
i.
Has high efficiency through the usage of s.................... energy or renewable energy.
ii.
Has a good water flow system, air ........................... and lighting.
Iii. Uses r............................... materials.
Exercise B:
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1.
a)
What is the type of object that absorbs heat better?
..............................................................................................
b)
What is the type of object that releases heat better?
..............................................................................................
2.
Heat radiate by an object depends on certain factors. List down two factors that affect the rate of heat
release by an object.
.............................................................................................................................................................................
3.
Diagram 6 shows two different mugs which added with 100 ml boiling water.
The temperature of the water in the mug was checked after 10 minutes.
a.
Predict the temperature of the water in both mugs.
.....................................................................................................................................................................
.....................................................................................................................................................................
b.
Explain your answer.
The .......................... mug is a better heat ............................ than the ..................... mug.
Exercise C (Chapter Revision):
1.
Mark (√) for the statements which are true regarding heat and temperature.
a.
Heat is a form of energy.
(
)
b.
Temperature can stored in a substance.
(
)
c.
Heat is the average energy of the particles in a substance.
(
)
d.
A substance at a lower temperature can have more heat than a substance
e.
2.
at a higher temperature.
(
)
A substance of higher mass can have more heat.
(
)
State the ways of heat flow .
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Situations
Ways of Heat Flow
a. A stool is placed a few metre from a fire and the side of the
stool facing the fire gets hot.
b. The Earth gets heat energy from the Sun.
c. The water in the surface is warmer because the warm water
rises.
d. The copper layer at the bottom of a stainless steel pan
transfers heat to the pan.
3.
a)
The diagram below shows a natural phenomenon that occurs in coastal area.
i)
On the diagram, draw an arrow in each box to show the direction of the convection current.
ii)
Name the phenomenon shown in the above diagram.
........................................................................................
iii) Describe how the phenomonenon above occurs.
At night, the ........................ cools faster than the ........................
The air above the the surface of the sea gets..........................., becomes ................ ...................,
e............................ and r.........................
The cooler air from the ........................ moves towards the ....................... to replace the rising air.
The flow of air from the .......................... to the ........................ forms a ................. .......................
b)
Mark (√) for the correct statement based on the diagram.
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4.
i)
The temperature of the land is higher than the temperature of the sea.
(
)
ii)
The temperature of the land is lower than the temperature of the sea.
(
)
The diagram below shows two types of glasses made of different materials.
Which glass is most suitable for keeping a drink cold for longer period of time?
The most suitable glass is ...................................................
Explanation: .................................. is a heat .......................... that can prevent the loss of heat.
5.
The diagram below shows two types of pots used for cooking curry chicken.
Which pot would you use if you want to keep the curry chicken warm for longer time.
The most suitable pot is .....................................................
Explanation: ................................. is a heat ............................. that can ........................ the loss of heat.
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6.
The diagram below shows two houses, A and B with different types of roofs.
a)
In hot weather, which house is more comfortable to stay in?
...................................................
b)
State the method of heat flow from the Sun to the roof of the house?
...................................................
7.
Azila is assigned to boil water by using a kettle.
a)
What is the way of heat flow from fire to the kettle during the heating?
.........................................................
b)
Explain how the way of heat flow stated in a) happens.
When the kettle is heated, the .............................. at the bottom of kettle start to ..................... faster.
The v........................ from one molecule to other molecules continues until the .......................travels
through the ..........................
c)
What is the way of heat flow involved from the bottom to the top of the water in the kettle during the
heating?
............................................................................
d)
Explain how the way of heat flow state in c) happens.
A liquid ................................. when it is heated so it becomes ............... ....................... and rises.
The ............................ liquid moves d.......................... to replace the hotter rising liquid.
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